The function operate_columns() is used to return some columns of a matrix as well as the columns resulting from adding or subtracting columns from each other
list containig the positions of the columns and/or vectors with operations. e.g. list (1, 3, c(1, -2)) means a matrix with the columns 1, 3 and the column resulting from substracting the 2on column from the 1st.
MAtrix withthe columns to operate with
A matrix with the columns asked for
1 2 3 4
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